Zippers Comparison: Metal, Plastic, and Nylon

The zipper's mechanism is a relatively simple concept, yet it's a complex component because its performance depends on the material it's made from. The three main types of zippers—metal, plastic (molded), and nylon (coil)—differ in their construction, performance, and application.

Characteristics, Advantages, and Applications

Metal Zippers

Metal zippers feature polished teeth made from metal like brass, nickel, or aluminum, which are clamped onto the zipper tape. They are the oldest type of zipper. Their primary advantage is exceptional durability and longevity, making them ideal for applications that require high resistance to stress and intensive washing. If a single tooth is damaged, metal zippers can often be repaired. Additionally, they offer a classic, high-end look that can serve as a decorative element.

Plastic Zippers

Plastic zippers, also known as molded zippers, are characterized by teeth that are injection-molded directly onto the zipper tape. The materials used to mold the teeth are most often POM—polyacetal resin—which gives them strength and durability. A key advantage of plastic zippers is their robustness and practical resistance to weather conditions. They are highly resistant to saltwater, chemicals, extreme temperatures, and UV radiation, making them a popular choice for outdoor and marine applications.

Nylon Zippers

Nylon zippers, often called coil zippers, feature coil-shaped teeth made from nylon or polyester filament, sewn onto the side tape. This construction makes them exceptionally flexible and lightweight. They have a "self-healing" ability—if a tooth is skipped, you can often correct the problem by moving the slider back and forth. They show strong horizontal tear resistance and are inherently more wind- and water-resistant than molded zippers.

Zipper Material Comparison

Choosing the right material is a key decision that affects a product's durability, appearance, and functionality. Select the zipper type below to see characteristics and compare properties.

The Most Common Disadvantages

Metal Zippers

Despite their advantages, metal zippers have certain limitations. They are prone to corrosion, especially in marine or humid environments. They are also significantly heavier than their plastic counterparts—a factor to consider in apparel projects to avoid weighing down light fabrics. Their rigidity makes them less flexible and can cause them to seize up. Shortening metal zippers requires specialized tools.

Plastic Zippers

The main drawback is that a damaged tooth usually means the entire zipper needs to be replaced. They are also stiffer than coil zippers, which makes them better suited for straight applications. They are commonly used in outdoor gear, sportswear, luggage, jackets, backpacks, and coolers.

Nylon Zippers

A disadvantage of nylon zippers is that the polyester threads used to sew the teeth can degrade from UV exposure, which requires covering the zipper in outdoor projects. Furthermore, their coil design is more prone to collecting dust and debris, which can lead to premature wear without proper cleaning and lubrication.